新型炭材料2022，Vol.37Issue(4)：724-733,10.DOI:10.1016/S1872-5805(21)60085-9
设计合成三维CNT/Ti3C2Tx气凝胶隔膜修饰层用于锂硫电池中多硫化锂的吸附和催化转化
Design of a 3D CNT/Ti3C2Tx aerogel-modified separator for Li–S batteries to eliminate both the shuttle effect and slow redox kinetics of polysulfides
摘要
Abstract
Lithium–sulfur (Li–S) batteries suffer from fast capacity fade and an inferior rate performance due to the shuttling of polysulfides (LiPSs) and slow redox kinetics. To solve these issues, a three-dimensional (3D) CNT/Ti3C2Tx aerogel was prepared, with Ti3C2Tx as the active matrix and CNTs as the conductive pillars, and used as a LiPS immobilizer and promoter to modify a com-mercial Li–S battery separator. The unique design of highly porous 3D aerogel results in the exposure of more Ti3C2Tx active sites by preventing the restacking of their sheets, which not only provides abundant charge transport paths, but also strengthens the adsorp-tion and catalytic conversion of LiPSs. The incorporation of CNTs forms a highly conductive network to connect the adjacent Ti3C2Tx sheets, thereby improving the conductivity and robustness of the 3D aerogel. As a result, a Li–S cell using the CNT/ Ti3C2Tx aerogel-modified separator has a high rate capacity of 1043.2 mAh g?1 up to 2 C and an excellent cycling life of over 800 cycles at 0.5 C with a low capacity decay rate of 0.07％ per cycle.关键词
碳纳米管/二硒化钼/锂硫电池/功能化隔膜/穿梭效应Key words
CNTs/Ti3C2Tx/Aerogel/Separator/Lithium-sulfur batteries分类
通用工业技术引用本文复制引用
尹菲,金奇,张喜田,武立立..设计合成三维CNT/Ti3C2Tx气凝胶隔膜修饰层用于锂硫电池中多硫化锂的吸附和催化转化[J].新型炭材料,2022,37(4):724-733,10.基金项目
This work was supported by National Natural Science Foundation of China (52072099,51772069).基金项目:国家自然科学基金(11504097,51772069). （52072099,51772069）
